Two professors teach the same class. The mean grade in Teacher G’s class is 80% (95% CI 72%, 88%); the mean grade in Teacher P’s class is 76% (95% CI 68%, 84%). In which class is the confidence...

Two professors teach the same class. The mean grade in Teacher G’s class is 80% (95% CI 72%, 88%); the mean grade in Teacher P’s class is 76% (95% CI 68%, 84%). In which class is the confidence interval more precise? In which class is the confidence interval more certain?

What is the decision for a hypothesis test (significant or not significant) if the value stated in a null hypothesis would have been each of the following?

1. Inside a stated confidence interval

2. Outside a stated confidence interval